RCBS Makes a universal decapping die that could help out. I like to use this as you can decap your dirty brass before you tumble it and the decapper in the sizer will knock out any media left in the flash hole. Sounds like you got a decent deal on the dies, but I would see if your decapper/ expander assembly will fit it because with out the expander passing thru the inside if the neck your really not sizing the brass!